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Title |
Proposal for Monitoring Concrete Hardening Process Inside Steel Formwork Using Ultrasound
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Authors |
홍진영(Jinyoung Hong) ; 이태민(Taemin Lee) ; 최하진(Hajin Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.3.317 |
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Keywords |
경화과정 모니터링; 강재거푸집; 초음파; 비파괴검사; 품질관리 hardening process; steel formwork; ultrasonics; non-destructive testing; quality control |
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Abstract |
This study proposes an ultrasonic measurement technique for monitoring the hardening process of concrete within steel formworks. Unlike conventional methods, the proposed approach offers a non-contact monitoring of concrete hardening inside the formwork. Ultrasonic waves with a frequency of 215 kHz were applied to the outer surface of a 3 mm-thick steel plate, and guided waves transmitted along the steel-concrete interface were measured. To validate the proposed method, both numerical simulations and experimental tests using mock-up specimens were conducted. The results demonstrated that, as the concrete hardened, the guided waves generated in the steel propagated into the concrete, causing noticeable differences in ultrasonic behavior. The analysis revealed that the surface wave velocity of the internal concrete could be monitored with a maximum error of 7.5 % (75 m/s). Further analysis confirmed that optimal measurement conditions were achieved using a minimum of five measurement points, a spacing of 60 mm, and a total measurement length of 240 mm. Future work will focus on the development of specialized measurement equipment for field applications and the testing of large-scale specimens.
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